α鉄中の炭素の挙動におよぼすチタンの効果

概要

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Internal friction and strain aging were studied in carburized Fe-0.5 at %Ti alloys. The carburized specimens were heated at 720℃ in herium of 1 atm and quenched. The Snoek damping was found to occur by the same single relaxation process as that of Fe-C alloy system, and the influence of texture, grain boundaries, cementite and magneto-mechanical damping on the relaxation strength were discussed. Strain aging was done at 15℃ for 2 minutes under the unloaded and loaded condition. The change of the height of Snoek damping (Q^<-1>_<max>) and the stress increment by Snoek ordering (⊿Y) with carbon content in the alloy were distinguished into three regions and discussed. It was found that in the region from zero to 0.12 wt% carbon Q^<-1>_<max> and ⊿Y were zero, this indicating that titanium strongly binds carbon, from 0.12 to 0.15 wt% carbon Q^<-1>_<max> and ⊿Y increased linearly with carbon concentration, which suggests that carbon dissolves into crystal lattice, and exceeding 0.15 wt% of carbon Q^<-1>_<max> and ⊿Y decreased with carbon content, which illustrates that cementite precipitation occurs. It was concluded that titanium atom and carbon atom combined by the atomic ration of 1 to 1 and that the solubility of carbon increased by 7.5 times due to the addition of 0.5 at %Ti at 720℃.
社団法人日本鉄鋼協会の論文
1973-09-01